Grinding or polishing wheel.



PATENTED DEG. 10,1907.

0. B. WATTLES. GRINDING OR POLISHING WHBE APPLICATION IIL ED NOV.l1. 1905. Q

a ,No. 873,398.

UNITED, STATES PATENT OFFICE. f

oYnA B. wATTLEs, or rRovmENca, RHODE ISLAND, ASSIGNOR TO SURFACING'MAGHINE COMPANY, oF Pnovrnnucn, RHODE'ISLAND, A OORPOBATIONOF RHODE ISLAND.

GRINDING QRIPOLI'SHING WHEEL.

I Patented Dec. 10, 1907.

Application filed Noveniber' 11' 1905. Serial No. 286.916.

To all whom it may concern:

Beit known that I, CYRA B. WATTLES, a

citizen of theUnited' States, residing at.

Providence, in the county of Providence and 'State of Rhode Island, have invented a new and useful Improvement in Grinding or Polishin Wheels, of which the following is a spec' cation.

pile fabric for polishing;

The object of my invention is 'to improve the construction of a grinding or polishing wheel or roll, whereby an abrasive or olish-.

. ing material is detachably secured to t e peripheral surface of the wheel orroll under spring tension, is firmly held. mechanically and by frictional contact, and is easily and quickly detached when required, a spring tension mechanism automatlcally taking up the slack in the abrasive or polishing mate- ,rial caused by the same coming into contact with the work, thereby keeping a constant tension on the abrasive or polishing material.

A further object of my mvention is to secure the ends of .a flexible abrasive material to a wheel or roll in a position for the ends to extend through a slot in the wheel or roll and overlap, thus bringin the abrasive surface of the material into frictional contact, there-' by materially assisting the spring tension mechanism in holding the abrasive material on the wheel or roll.

-My invention consists in the peculiar and novel construction of a grinding or polishing wheel or roll whereby a flexible abrasive material is detachably secured to the peripheral surface of the wheel or roll by a spring tension mechanism, and by overlap ing the ends of the abrasive material there y bringing the abrasive surface of the material into frictional contact, with details of construction, as will be more. fully set forth hereinafter.

Figure 1 is a face view of my improved or polishing wheel, showing a strip of flexible grinding material secured to the face 0 the same. Fig. 2 is an end view of the w eel, showing the end plate artly brokeri awa to show the counterba anced portion. Flg. 3 is an enlarged sectional view taken on line 3 3 of Fig. 2, showing the construction of the tension mechanism and the detachable tool for setting the same. Fig. 4 is a detail sectional view taken on line 4 4 of Fig. 3, showing the position the tension mechanism would assume-in holding the overlapping ends of the abrasive material in '65 frictional contact. Fig. 5 is a detail sectional view similar to F1 4, showing a modified form of means for olding the overlapping ends of the abrasive materiaL. Fig. 6

is .a detail sectional view similar to. Fig...4,. 7o

. showing a still further modified form of means for holding the overlapping ends of" the a rasive material. Fig. 7 is an enlarged detail view of the end of the arm in the tension'mechanism, showing the means for securingone end of the abrasive materialto the arm, and Fig. 8 is an enlarged perspective view of one end of the abrasive material;-

In the drawings, a, indicates -a-shaft, b a n cylindrical wheel, 0 a spring tension mechanism, a detachable tool for setting the" sprin tension mechanism, and e a stri of flexibc abrasive material secured to the peripheral surface of thewheel b by the tension mechanism 0. The shaft a is supported in suitable bearings and revolved at a hi h rate of speed by any usual means; T e wheel I; is constructed to have the central huh I)? secured to the shaft 0 in any Well known way, the closed end 12 the peripheral flange b in the face of which is the slot 1) on a',line with the shaft a, the flange b thickened on its inner face adjacent the slotb forming the cross rib b with the semicircular concave face b merging into the plate I)", is secured to the edge of the flanee by-screws'in a position for the hole 6 to coincide with the hole I) in the boss 6 and for the opening b to coincide with the opening b-' in the end 11 as shown in Figs. 2 and 3.

The spring tension mechanism 0 consists of a stud c secured to the boss 6 in the hole b by riveting and having the cental hole 0 in its opposite end, a rectangular pivoted member 0 having the central hub o in which is the hole 0 for the stud c, the oppositely-disposed flat arms 0 and 07 ex- I tending outwardly from the hub and approximately the interior width of the wheel. The outer arm 0 is constructed to have a circular hole 0 111 the end extending through the Width of the arms and merging into a narrow slot'c which extends from the hole 0 through the end of the arm, as shown in dotted lines in Fig. 3 and in full lines in Fig. 7.- A spring 0 is secured at one end to the end 6 of the wheel. This springextends around the boss 6 and is secured at its other end to the arm c, the tension of the spring tending to move the arm 0 to the right or toward therib Z1 A stop pin 0 is secured to the end Z of the wheel in a position for the arm a to engage with it and limit the setting movement of the pivoted member 0 against the tension of the spring 0 The stud c extends throughthe hole 0 in the pivoted member 0 and through the hole I) in the end plate b flush with the outer surface of the plate, as shown in Fi 3.

The tool (1? consists of a lever (2 having the fulcrum pin (1 the pin d and the spring actuated pin (1 in a position for the fulcrum pind to enter the hole c in the end of the stud c, the pin (1 to engage with the arm'c on the side toward the rib through the slot 6 in the end plate 6 and for the spring actuated pin (Z to enter the off-set hole 6 in the end plate I) in setting the spring tension mechanism.

The abrasive material 6 consists vof a strip of paper or cloth covered on one surface with arr-abrasive substance such as sand, emery or corunclum, and having the flat end 6 and the enlarged and strengthened end eh This end e is formed from the gnaterial or by folding a strip of sheet metal ever the end of the abrasive material, as shown in dotted lines in Fig 8, and then folding the first fold over, as sho wnin full lines in Fig. 8.

y In the operation of applying the abrasive -inaterial to the'wheel b the end ofthearm cis brought under the slot b by partly. rotating the tool (Z until the spring actuated pin (Z snaps into the hole-b The arm 0 1s nowheld in its set position against the tension of the spring 0 The enlarged end 6 of the abrasive material 6 is now inserted sideabrasive material on the wise into thehole c in the end .of the through either of arm c the openings b or b and the slot Z1 with the abrasive surface on the outside. The strip of abrasive material is now carried around the peripheral surface of the wheel on the flange (Wand the flat end 6 bent or folded under through the slot 1) ontoithe semi-circular concave surface I) of the rib 6 The tool d is now removed. The tension of the spring 0 moves the arm 0 toward theirib and brings the abrasive surface of the material into frictional contact, as shown in Fig. 4, thus securel holding the'abrasive material on the whee The wheel revolves at a high rate of speed in the direction of the arrows, as shown in Fi s. 2 and =1. If the abrasive material sho (1 become slack by contact with the Work, the tension of the s ring 0 on the arm a Will take up the slacff, as required.

In the modified form, as shown in Fig. 5, the flat end e of the abrasive material is inserted first and held'on the rib b by a spring clip a". rib b and may have teeth to assist in holding the end of the abrasive material between the clip and the rib and is opened to receive the same by inserting a tool through the hole I)" in the flange b and pressing in on the cli in the modified form, as shown in Fig. 6,

both ends of the abrasive material are constructed as shown in Fi 8. A circular hole 6 is formed inthe rib 5 which merges into a narrow slot 12 which extends from the hole through the concave semi-circular surface I) and the end of the abrasive material corresponding to the end 0 is secured in the same.

As shown in'both of the modified forms the abrasive surface of the material is brought into frictional contact, thus materially assisting in holding the same on the wheel.

Having thus described my invention, I claim as new and desire to secure by Letters Patent 1. A grinding or polishing wheel having a slot in the peripheral surface, a strip of flexible abrasive material supported on the peripheral surfaceof the wheel in position for the ends to extend through the slot and overlap, and means for automatically exerting a tension on one end of the abrasive material, whereby the ends of the material are. brought into frictional contact and the slack of the material is taken up.

2. In a grinding or polishing wheel, means for detachably securing a strip of flexible eripheral surface of the wheel in a position for the ends of the material to overlap, means for automatically bringing the two ends into frictional contact and exerting a spring tension on one end to take up the slack.

This clip is secured to the 3'; a or polishing wheel, means In testimony whereof .I have signed my f0: detachably seourmg a strip 'of flezgible name to this speeification in the-presence'of abrasive material at one end to the wheel'in two subscribing witnesses.' H

a position for the ends of the materiai to CYRA B. WATTLES.

5 overlap, and means for ailtomatially exert.- Witnesses:

- ing a spring tensionlon one end; to take up 1 ABA HAGERTY,

the slack. J. A.MILLER. 

